This is one R/C Airplane 9x6E APC Thin-Electric Composite Propeller
by Landing Products.

FEATURES

APC props are manufactured using a pultrusion process. This method
causes the fiberglass "fibers" to be oriented axially in 1/2" long
pellets, allowing for a higher fiber (60%) to resin (nylon binder)
density. Providing substantially higher strength and stiffness than
glass filled nylon.
The additional stiffness is beneficial to control of vibration
resonance response.
The higher strength allows the use of thinner cross-sections,
beneficial to weight and aerodynamic efficiency.
Competition proven.
Dark gray composite material.